Some of the most memorable NPCs in are devils and demons, but the universe has many more that Larian Studios could include in potential DLC. Though not technically part of 5e canon yet, Larian's popular RPG takes place following the hardcover adventure, in which the players travel to the first layer of the Nine Hells and encounter an array of cambions, demons, and devils. Any number of these characters would be perfect for inclusion in DLC.
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Players already get to interact with some interesting devils like Raphael, the archdevil that tries to trick the party into signing away their souls at every turn, and the cambion Mizora, who is the warlock patron to recruitable companion and party member Wyll. Other devils like the orthon Yurgir and incubus/succubus Haarlep already appear throughout the game, making the Nine Hells an easy place to pull potential DLC content from. Even when the game ends, the Blood War between demons and devils is still raging, giving Larian Studios an easy way to include these cambions and demons while tying directly into storylines already brought up in the main story.
Zariel is a fallen angel, and the main antagonist of. She is mentioned numerous times throughout, but never makes an actual appearance. In any DLC where the players get to travel into the Nine Hells themselves, Zariel would make an excellent addition. Just as in the 5e adventure, she could overshadow everything the players see and do, being an ongoing threat, and eventually give the party a well-earned choice: redeem Zariel or destroy her. While this is the same choice players get in traditional at the end of the adventure, seeing it live on-screen would definitely increase
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